Skip to content
BrakesPart report

2004 Mercury Grand Marquis Brakes Problems

Complaints
7about this part
Share
2%of 348 total for the year
Median mileage
110,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 7 complaints about the brakes of the 2004 Mercury Grand Marquis, 2% of the 348 complaints for this model year. Where a mileage was given, the median is 110,000 miles. 1 of these say a crash was involved, according to the filers.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“The contact owns a 2004 Mercury Grand Marquis. The contact stated that while driving at approximately 5 MPH and depressing the brake pedal, the vehicle accelerated. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 162,000.”

NHTSA complaint #10631030, filed 2014-09, 162,000 miles

“The contact owns a 2004 Mercury Grand Marquis. While the vehicle was coming to a stop, the contact depressed the brake pedal and the speed and rpms increased without warning. The contact continued to depress the brake pedal; however, the vehicle failed to respond. The contact powered the vehicle off and noticed blue smoke emitting from the rear of the vehicle. The vehicle was taken to the dealer, but the failure was unable to be determined. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 58,000. Ma 09/25 updated 12/05/2017”

NHTSA complaint #10735745, filed 2015-07, 58,000 miles

“When attempting to press the brake pedal, the driver also pressed on the accelerator pedal and caused the vehicle to accelerate which made it difficult to stop the vehicle. The consumer stated that the pedals were too close to each other.”

NHTSA complaint #10061644, filed 2004-04

“The contact owns a 2004 Mercury Grand Marquis. While driving 8 MPH the vehicle did not stop when the brake was depressed. He stated that it was approximately 30 seconds before the vehicle stopped. The road conditions were clear. The vehicle was never inspected. Approximately four days later the contact experienced the same problem. He stated that his vehicle crashed into a wooden pole. The vehicle was towed to a mechanic to repair the damage as a result of the crash. The mechanic was unable to diagnose the failure. The current mileage was 36,000.”

NHTSA complaint #10189039, filed 2007-04

Related service bulletins

Brakes: other model years

YearComplaintsShare of year
2011111%
201028%
2009623%
20081013%
200766%
2006128%
2005184%
200472%
200372%
200268%
20011610%
20001811%
199995%
199875%
19973511%
19962310%
19953017%
19941912%
19932215%
19924819%
19911316%
1990814%
1989610%
198823%
1986210%
1983114%

Other parts of the 2004 Mercury Grand Marquis

Exterior lighting
207 complaints
Steering
65 complaints
Electrical system
40 complaints
Vehicle speed control
23 complaints
Visibility (wipers, defrost, mirrors)
11 complaints
Engine cooling
10 complaints
Transmission and drivetrain
9 complaints
Body and structure
8 complaints
Air bags
6 complaints
Fuel system
6 complaints
Interior lighting
6 complaints
Tires
5 complaints

← All problems reported for the 2004 Mercury Grand Marquis

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology